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For the current week, the overall ratings of 12 Semiconductor stocks are worse, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Tower Semiconductor Ltd. (NASDAQ:TSEM) ratings are on the decline this week as the company earns an F (“strong sell”). Last week, it received a D (“sell”). Attribute Error. In Portfolio Grader’s specific subcategories of Earnings Growth, Earnings Momentum, Earnings Revisions, Equity, Cash Flow, and Sales Growth, TSEM also gets F’s. For more information, get Portfolio Grader’s complete analysis of TSEM stock.

Applied Materials (NASDAQ:AMAT) is having a tough week. The company’s rating falls from a D to an F. Applied Materials manufactures and produces equipment, software, and other products for the flat-panel display, solar, and related industries. The stock receives F’s in Earnings Growth, Earnings Momentum, and Earnings Revisions. Margin Growth and Sales Growth also get F’s. The trailing PE Ratio for the stock is 130.60. For a full analysis of AMAT stock, visit Portfolio Grader.

This week, Hanwha SolarOne’s (NASDAQ:HSOL) rating worsens to a D from the company’s C rating a week ago. Solarfun Power Holdings manufactures photovoltaic (PV) cells and modules, provides PV cell processing services to convert silicon wafers into PV cells, and supplies solar system integration services in China. The stock gets F’s in Earnings Revisions, Equity, and Cash Flow. Margin Growth and Sales Growth also get F’s. For a full analysis of HSOL stock, visit Portfolio Grader.

This is a rough week for ReneSola (NYSE:SOL). The company’s rating falls to D from the previous week’s C. ReneSola develops, manufactures and sells solar wafers, which are thin sheets of crystalline silicon material mainly made by slicing monocrystalline or multicrystalline ingots. The stock receives F’s in Earnings Growth, Earnings Revisions, and Equity. Cash Flow and Margin Growth also get F’s. To get an in-depth look at SOL, get Portfolio Grader’s complete analysis of SOL stock.

The rating of Pericom Semiconductor (NASDAQ:PSEM) declines this week from C to a D. Pericom Semiconductor designs, develops, and markets interface integrated circuits for the transfer, routing, and timing of high-speed digital and analog signals. The stock gets F’s in Earnings Revisions and Margin Growth. The stock price has fallen 18.4% over the past month, worse than the 4.7% increase the Nasdaq has seen over the same period of time. To get an in-depth look at PSEM, get Portfolio Grader’s complete analysis of PSEM stock.

LTX-Credence (NASDAQ:LTXC) experiences a ratings drop this week, going from last week’s C to a D. LTX-Credence designs, manufactures, and markets automatic test equipment for the semiconductor industry. In Earnings Revisions, Earnings Surprise, Equity, and Margin Growth the stock gets F’s. For a full analysis of LTXC stock, visit Portfolio Grader.

TriQuint Semiconductor (NASDAQ:TQNT) earns an F this week, moving down from last week’s grade of D. TriQuint Semiconductor supplies communications companies with modules, components and foundry services. The stock gets F’s in Earnings Growth, Earnings Revisions, and Margin Growth. As of Jan. 16, 2013, 11.1% of outstanding TriQuint Semiconductor shares were held short. To get an in-depth look at TQNT, get Portfolio Grader’s complete analysis of TQNT stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.